I am wondering if there is a way to create a small description for a group of items that I’m missing. I’m creating an onboarding template that includes 7 different groups of tasks and I was thinking that it would be helpful to be able to add a little text to the title of each group similar to the description box at the top of the board that can be more general than the specific instructions I’ll be putting in the comments of each item.

In the screenshot I’ve attached I have added text highlighted in yellow that I would like to be able to add as a group description (ideally it would be a lighter text under the group title like the board description, not quite as garish as what I have here )

Cool suggestion!
Currently we only have the option to add a description for the entire board (in the board description).
I have a work around that I have been using myself for some of my boards.
In each group I created an item named “talk” or “guideline” (but you can name it anything you want!).
In the updates section of that item, I write a description about the group.